CN201136051Y

CN201136051Y - Continuous casting tundish apparatus for preventing Al2O3 from adhering on downspout wall

Info

Publication number: CN201136051Y
Application number: CNU2008200161183U
Authority: CN
Inventors: 许荣昌; 蒋鲤平; 王梅; 孙庆亮
Original assignee: Laiwu Iron and Steel Co Ltd
Current assignee: Shandong Iron and Steel Group Co Ltd SISG
Priority date: 2008-01-04
Filing date: 2008-01-04
Publication date: 2008-10-22
Anticipated expiration: 2018-01-04

Abstract

The utility model relates to a continuous casting bakie device which prevents Al2O3 from attaching the water gap wall, which comprises a bakie upper water gap and a rotary stopper, wherein, the shape of an inner cavity of the water gap is an inverted bugle arc structure; the inner wall of the upper water gap is smooth; the stopper can be rotated during the range of 0-10 DEG. The implementation of the continuous casting bakie device does not need to improve the existing bakie, and only need to replace the bakie upper water gap. The bakie upper water gap which adopts the continuous casting bakie device can prevent the phenomenon of water gap stoppage caused by attachment of Al2O3 on the bakie upper water gap wall when Al killed steel, Al-bearing steel, Ti-bearing steel and rear earth steel are cast.

Description

A kind of Al that prevents 2O 3The continuous casting tundish apparatus that adheres to mouth of a river wall

Technical field

The utility model relates to the Ferrous Metallurgy continuous casting installation for casting, particularly a kind of Al that prevents ₂O ₃The continuous casting tundish apparatus that adheres to mouth of a river wall has comprised tundish upper nozzle and stopper, belongs to the metallurgical continuous casting technical field.

Background technology

Continuous casting process is that 20 century 70s grow up, and is promoted rapidly afterwards and develops.But in many stoves casting process, tundish upper nozzle and submersed nozzle inwall are usually because Al ₂O ₃Adhere to and stop up, had a strong impact on production efficiency.And attachment comes off in casting process easily, falls in the molten steel, causes steel stream unstable, thereby affects the quality of steel billet.At casting Al killed steel, contain the Al steel, when containing Ti steel and rare earth steel, clogging is especially serious.In continuous casting was produced, Submerged Nozzle Clogging Course can be changed immediately, yet can't change behind the clogging of tundish nozzle were, so the tundish upper nozzle obstruction is the fatal link of direct casting.

Nozzle blocking (overlapping eye) is the bottleneck of producing ultra-low-carbon steel, containing aluminum steel, and present solution commonly used is the oxidation that improves mouth of a river material and structure, protects the sour molten aluminium of cast minimizing, and still, effect is unsatisfactory during practical application.CN1431067 discloses a kind of purging upper nozzle for continuous casting tundish, comprise ventilative hollow truncated cone upper nozzle brick, last steel bushing, following steel bushing, the airtight district of upper nozzle brick outside slurry, the raw material weight ratio of nozzle brick is: zircon sand 25～30%, compact alumina 35～40%, mullite powder 30～35%.This invention increases gas permeability by changing mouth of a river material, prevents Al in the molten steel ₂O ₃And other impurity adheres at the filling pipe end inner chamber, thereby preventing that the aperture from dwindling causes obstruction.CN2609687 discloses a kind of continuous casting tundish zirconium mullite matter filling pipe end, one end of its integral body is an interface, the other end is the steel inflow entrance, internal layer is the inner wall layer of zirconium mullite matter, one section is provided with the iron-clad coating in the middle of the inner wall layer outside, and iron-clad is established the argon gas inlet pipeline, and this utility model strengthens elevated temperature strength and slag corrosion resistance ability, increase substantially with gas permeability, avoid being piled up in the generation that mouth of a river inner chamber causes the little even clogging of steel rheology because of impurity.Because the liquid steel temperature height than great, is protected difficulty, and the improvement of mouth of a river material and structure can be brought into play certain effect, still, also do not solve the nozzle blocking problem at present in process of production at all.

Summary of the invention

For the deficiencies in the prior art, the utility model provides a kind of can effectively prevent Al ₂O ₃The continuous casting tundish apparatus that adheres to mouth of a river wall.

Summary of the invention

The Al that effectively prevents of the present utility model ₂O ₃The continuous casting tundish apparatus that adheres to mouth of a river wall mainly comprises filling pipe end and rotatable stopper.The present inventor finds that through research causing the basic reason of nozzle blocking is the high α-Al of fusing point ₂O ₃Reduction along with temperature in casting process is separated out, because mouth of a river molten steel mobile has Gradient Effect, cause the high-melting-point particle of mouth of a river wall to be attached on if having time on the coarse mouth of a river inwall, and adsorb other high-melting-point particle, cause the dross of mouth of a river wall, the preferential dross of filling pipe end, order extends downwardly into the lower mouth of a river, and under the production temperature, the intensity of this tamper is not too high.Therefore, by changing filling pipe end cavity shape structure, and the rotation of the low-angle of stopper, can remove the material of dross.

Detailed Description Of The Invention

Technical solutions of the utility model are as follows:

A kind of Al that prevents ₂O ₃The continuous casting tundish apparatus that adheres to mouth of a river wall, comprise tundish upper nozzle and stopper, the filling pipe end inner chamber is the arcuate structure of falling loudspeaker, filling pipe end upper port diameter is less than the diameter of the arbitrary cross section of inner chamber, the diameter of inner chamber cross section increases from the top down successively, wherein inner chamber position in filling pipe end middle part is 1.1～1.3 times of back cut diameter, and lower port diameter is 1.2～1.5 times of back cut diameter, as shown in Figure 1.

The inwall of described tundish upper nozzle inner chamber requires smooth, and roughness is at 0～10 micron, in the material particle diameter of inwall.

Described stopper is rotatable stopper, can stopper self geometry center line be the axle center, and carrying out angle is 0～10 ° of rotation, to remove a spot of dross thing on the internal chamber wall.Make that stopper is online to be rotated, can by directly manually simple operations finish.

The tundish upper nozzle with smooth inner wall that the utility model provides, the material particle of inwall is less than the Al that separates out ₂O ₃Granularity, can prevent Al ₂O ₃Absorption, thus the patency that steel flows increased; The filling pipe end inner chamber is inverted tubaeform, can effectively prevent because Al ₂O ₃The phenomenon of adhering to the nozzle blocking that causes at the tundish upper nozzle wall.

Prevent Al in order to reach goodly ₂O ₃The effect of adhering at mouth of a river wall, the utility model also improves the stopper of filling pipe end top in the prior art, the stopper of prior art is only can pass through the liquid level robot control system(RCS), the control stopper moves up and down, thereby control steel stream size, the used stopper of the utility model is except utilizing the liquid level robot control system(RCS), the control stopper moves up and down, thereby outside the control steel stream size, can also be take stopper self geometry center line as the axle center, carrying out angle is 0～10 ° of rotation, to remove dross thing a small amount of on the internal chamber wall.

Use of the present utility model needn't change existing production line, only need to replace with the mouth of a river and transform stopper, can effectively avoid at casting Al killed steel after the use, contain the Al steel, when containing Ti steel and rare earth steel because Al ₂O ₃The phenomenon of adhering to the nozzle blocking that causes at the tundish upper nozzle wall.

Description of drawings

Fig. 1 is a vertical section structure schematic diagram of the present utility model, 1. stoppers wherein, 2. filling pipe end, 3 filling pipe end inwalls, 4. filling pipe end outer wall.The stopper direction of rotation is the rotation take stopper self geometry center line as the axle center among the figure.

The specific embodiment

Embodiment:

Structure of the present utility model comprises tundish upper nozzle 2 and rotatable stopper 1 as shown in Figure 1.The inner chamber 3 of tundish upper nozzle is shaped as the arcuate structure of falling loudspeaker, and the filling pipe end inner wall roughness prevents Al at 0～10 micron ₂O ₃Adhere at the filling pipe end wall.Filling pipe end 2 upper port diameters are less than the diameter of the arbitrary cross section of inner chamber, and the diameter of inner chamber cross section increases from the top down successively, and wherein inner chamber position, filling pipe end 2 middle part is 1.1～1.3 times of back cut diameter, and lower port diameter is 1.2～1.5 times of back cut diameter.Prevent Al in order to reach goodly ₂O ₃In the effect that mouth of a river wall adheres to, stopper 1 can rotate in 0～10 ° of scope.Enforcement of the present utility model does not need existing tundish is transformed, and only needs to change tundish upper nozzle, has reached at casting Al killed steel after transformation is used, contains the Al steel, when containing Ti steel and rare earth steel, has prevented because Al ₂O ₃The phenomenon of adhering to the nozzle blocking that causes at the tundish upper nozzle wall.

Claims

1, a kind of Al that prevents ₂O ₃The continuous casting tundish apparatus that adheres to mouth of a river wall, comprise tundish upper nozzle and stopper, it is characterized in that, the filling pipe end inner chamber is the arcuate structure of falling loudspeaker, filling pipe end upper port diameter is less than the diameter of the arbitrary cross section of inner chamber, the diameter of inner chamber cross section increases from the top down successively, and wherein inner chamber position, filling pipe end middle part is 1.1～1.3 times of back cut diameter, and lower port diameter is 1.2～1.5 times of back cut diameter.

2, the Al that prevents as claimed in claim 1 ₂O ₃Adhere to the continuous casting tundish apparatus of mouth of a river wall, it is characterized in that, the inner wall roughness of tundish upper nozzle inner chamber is at 0～10 micron, in the material particle diameter of inwall.

3,, the Al that prevents as claimed in claim 1 ₂O ₃Adhere to the continuous casting tundish apparatus of mouth of a river wall, it is characterized in that, described stopper is rotatable stopper, take stopper self geometry center line as the axle center, carries out angle and be 0～10 ° rotation.